A father is now planning a savings program to put his daughter through college. She is 13, she plans to enroll at the university in 5 years, and she should graduate in 4 years. Currently, the annual cost (for everything-food, clothing, tuition, books, transportation, and so forth) is $15,000, but these costs are expected to increase by 5% annually. The college requires that this amount be paid at the start of the year. She nowhas $7,500 in a college savings account that pays 6%annually. Her father will make six equal annual deposits into her account; the first deposit today and the sixth on the day she starts college. Howlarge must each of the six payments be? [Hint: Calculate the cost (inflated at 5%) for each year of college and find the total present value of those costs, discounted at 6%, as of the day she enters college. Then find the compounded value of her initial $7,500 on that same day. The difference between the PV costs and the amount that would be in the savings account must be made up by the father's deposits, so find the six equal payments (starting immediately) that will compound to the required amount.]

a) Change the amount for college costs from $15,000 to $22,000
b) Change the amount for inflation from 5% to 4%.
c) Change the rate earned on the account from 6% to 7%.